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<br /> <br />002041 <br /> <br />. <br /> <br />1. INTRODUCTION <br /> <br />1.1 Pro~ram Identification <br /> <br />Program NWO 1. <br /> <br />1. 2 Program Application <br /> <br />This program may be referred to as a river network model or a <br />flow and salt accounting model. Although the program incorporates <br />several features common to a simulation, it is more accurately <br />described as an accounting or bookkeeping system. It does permit <br />operation of a river system, routing flows and salts through a <br />system which can include reservoirs and a branching network. <br />Reservoir operations are fairly flexible, being specified by the <br />user. A basic time frame of 1 month is used. <br /> <br />. <br /> <br />The quality system is treated as a conservative one. Thus, the <br />precipitation and dissolution of salts are not explicitly simu- <br />lated. They may be roughly accounted for by proper use of the <br />water and salt inputs, but this presupposes that the user has <br />this information at his disposal. This input requirement, placed <br />upon the user, highlights the difference between the accounting <br />and simulation methods. If the chemical reactions and pathways <br />were simulated, the output information from the simulation would <br />be precisely the inputs required for the accounting model. However, <br />the simulation model would also require additional inputs to <br />define soil and water chemistry characteristics. <br /> <br />The term salinity means the total dissolved solids. Salinity <br />units for most inputs are specified by the user. For example, if <br />imports are included, either the mass of salts in 1,000 tons or <br />the concentration in parts per million (ppm) or tons/acre-foot can <br />be specified. Similarly, output quality units may be selected as <br />any combination of these. <br /> <br />Input data include the system configuration; reservoir character- <br />istics, parameters, initial conditions, evaporation rates, and <br />operating criteria; upstream and downstream boundary inputs; water <br />use inputs inCluding import/exports, exports, irrigation, and variable <br />exports whose magnitudes depend on the availability of water; and <br />run and output options. <br /> <br />. <br /> <br />Output includes printed and cathode ray tube (CRT) plots of <br />results at various river locations and reservoirs. Initial input <br />data, detailed month-by-month results, and a concise summary for <br />the entire run including simple descriptive statistics can be <br />printed. Computed flows and salinity at the downstream boundary <br />may also be written on magnetic tape and saved for future use. <br /> <br />(rev. 07/75) <br /> <br />